I have an older FF Pentax 80-200 zoom, if I use an adapter an PK-M43  what focal range do I end up with?

Like for like from 80-200mm, no calculations needed unless you're using a "speedbooster" optical adapter that reduces focal length.If it's not an AF lens, you should tell IBIS what focal length you will be shooting at, since the system needs that information to work correctly.Good luck!Rick

bferg wrote:I have an older FF Pentax 80-200 zoom, if I use an adapter an PK-M43 what focal range do I end up with?The focal range will not change.However, what will be different is the field of view when comparing the very same lens at the same f-stop with a FF Pentax: you get twice the reach and twice the depth of field with the M43 adapter.

bferg wrote:I have an older FF Pentax 80-200 zoom, if I use an adapter an PK-M43 what focal range do I end up with?The field of view changes with the M4/3 sensor crop factor of 2x.An 80-20mm lens would have the field of view of 160-400mm.

jeffharris wrote:bferg wrote:I have an older FF Pentax 80-200 zoom, if I use an adapter an PK-M43 what focal range do I end up with?The field of view changes with the M4/3 sensor crop factor of 2x.An 80-20mm lens would have the field of view of 160-400mm... in FF terms

you will "see" only the central portion of what you used to see using your Pentax